CyberHunter
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// Other services

Port 2057: Rich Content Protocol

Port 2057 is assigned by IANA to rich-cp (Rich Content Protocol).

2057

How rich-cp works

Other services
client:2057rich-cpresponse client:2057rich-cpresponse

The client sends a request to port 2057 and the rich-cp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 2057 dangerous?

We have no specific security note for port 2057. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 2057

ServicePortTransportDescriptionReferenceUpdated
rich-cp 2057 TCP, UDP Rich Content Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2057, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2057'      # process listening on 2057
sudo lsof -nP -i :2057

macOS

sudo lsof -nP -i :2057

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2057 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2057
netstat -ano | findstr :2057

From another machine

nmap -p 2057 -sV <host>
sudo nmap -sU -p 2057 <host>
nc -zv <host> 2057

Block it in the firewall

sudo ufw deny 2057/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2057" -Direction Inbound -LocalPort 2057 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2057 used for?

Port 2057 is assigned by IANA to rich-cp (Rich Content Protocol).

Is port 2057 TCP or UDP?

Port 2057 is registered for TCP and UDP.

Is it safe to open port 2057?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 2057 is open?

On Linux run "ss -ltnup 'sport = :2057'", on macOS "lsof -nP -i :2057", and on Windows "netstat -ano | findstr :2057" to see the local process. From another machine, "nmap -p 2057 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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